Lamp.



H. A. DOUGLAS.

LAMP.

APPLlCATlON HLED MAR. 9,1914. RENEWEDDEC- 21| 1916.

patem w19-,1211s.

" UNITED sTATEs PATENT oEEIoE.

HARRY A. DOUGLAS, F BRONSON, MICHIGAN.

LAMP.

Application led March 9, 1914, Serial No. 823,365.

To all whom 'it may concern.'

Be it known that I, HARRY citizen of the United States, reslclin at Bronson, in the county of Branch and tate of Michigan, have invented a certainr new and useful Improvement in Lamps, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

My invention relates to reflecting electric 'lamps and has for oneeof its objects the provision of an improved mounting for the glass front which is commonly provided for such a lamp. By means of one characteristic of my invention the door or lid which permits access to the interior of the lamp structure operates as a clamping device for holding the glass :front against the portion of the lamp structure to the rear of the glass.-

In accordance with another feature of my invention the glass front is provided with a resilient mounting that operates to maintain the glass front in its normal position'but which will-yield to allow the glass momentarily to shift. in its own plane and'- with reference to the balance of the lamp structure when the lamp structure is subject `to` sufiicient shock, whereby fracture of the glass front is prevented. The lid which operates to clamp the glass in position has such "pressure upon the glass as to hold the glass 1n its own plane while at the same time permitting the glass to move in its plane under the circumstances described. The resilient mounting for the glass is desirably carried by thelid.

The invention has as another of its characteristics the rovision of an improved means of attaching the lid to the portion of the lamp structure to the rear of the glass.

I will explain my invention more fully by reference to the accompanying drawing showing the preferred embodiment thereof and in which Figure 1 is a sectional elevation on line 1-1 of Fig. 2; Fig. 2 is a sectional -elevation on line 2-2 of Fig. 1; Fig. 3 is a plan view on line 3-3 of Fig. 2; and Fig. 4 is a sectional view on line 4 4 of Fig. 2.

Like parts 'are indicated by similar characters of reference throughout the different figures.

The back element a of the lamp is desirably formed of sheet metal as is also the Specification of Letters` Patent.

YPatented Feb. 19, 1918.

Renewed December 21, 1916. Serial No. 138,286.

,which is the reflecting surface, is suitably A. DOUGLAS,

, light which emanates from the incandescent brightened for the purpose of reflecting the lamp c. The front of the lamp is provided v with a door or lid d, later to be more fully described, for affording access to the interior of the lamp structure. The electric lamp bulb c has a base d that carries the lamp terminals, this base being suitably held within a sleeve f as by means of a bayonet catch 'g'. The back element a and the reflectorelement b are in separable relation,

the insetting rim lz, of the latter having slldmg fit with the outsetting rim 2' of the former, the extent to which the rim lz may move inwardlybeing limited by its engagement with the flaring portion of the back a as illustrated in Fig. 1. The back and reflector parts are maintained in the xed relationship illustrated in Fig. 1 by means of the shell or sleeve f which is threaded at its rear there to be engaged by a nut lc having an enlargement receivedwithin a cup formation provided at the back of the element a. The shell f carries a flange Z which engages the front face of the reflector b, the flange Z and the nut l: coperatng to maintain the reflector and the backA element a inthe normal relationship illustrated in Fig. 1. My companion application Serial No. 713.317, field August 5, 1912, contains claims which cover the structure employing the shell f, nut 7J, and flange Z for the purpose described. The back element a carries a socket m from which conductors a lead to the lamp, and which socket is capable of receiving a terminal plug connected withthe source of current which is to supply the lamp.

The door or lid d desirably carries three spring hooks o, illustrated most clearly in Fig. 4', which are adapted to be projected through slots p provided in the flange continuation g of the deflector structure b, and which flange continuation g surrounds the reflector proper and is interposed between the same andthe rim h 'of the reflector. When the lid is to be placed in position the hooks 0 are so registered with the slots p that the hook endspof the hooks may pass through said slots whereafter the lid may be turned so as to effect engagement of the hooks with the rearwardly extending lugs or ridges r that margin the ends of said slots, also as indicated clearly in Fig. 4, the hooks yielding as they ride over` the lugs and positioning themselves as indicated in io each glass sup-port t may be integrally forme Fig. 4 by their own. resilience when the .iid has been suiiiciently turned.

The light transmitting cover s, preferabl of glass, is desirably permanently associate with the lid d, to which vend the lid` carries a number of insetting glass holding cli s t, which are of stri spring metal, and w ich are bent to vafl'or ooves for receivingy the lass as illustrate most clearly in Fig. ,1. or the sake of economy inv manufacture of the same plece of strip spring metal with the sprin hook o. The resilient glass supportin e ements t operate to maintain the norma position of the glass s with respect to the lid d but yield, upon sufficient shock, to

permit the glass to move slightly in its own plane with respect to the balance of the lamp structure so that the glass will not be fractured. The spring pressurewith which the hooks o maintain the rear face of the glass s against the front of the reflector b is not sufficient to prevent the movement of the lass .s' in its own plane when loccasion.

requires, the parts being properly proportioned to make the pressure of the lass s upon the reflector b suiiicientlylig t' for this purpose, though the hooks o 4operate to hold the lid d properly in place, these'hooks ters Patent the following ment; a concave reflector in lfront of the back t.

1. A lamp structure lncluding a back eleelement; a lamp bulb; a mounting forl 'the 4lamp bulb which holds the back element and reflector together; a light transmitting cover at the forward end of the reflector; a resilient mounting for the cover that permits the cover to move in its plane; a door engaging the front face of the cover; and spring mechanism for separably coupling the door with a door supporting portion of thelamp structure and exerting pressure upon the cover that permits the cover to move in .its ownplane. i

2. A lamp structure including a back element; a concave reiector in front of the back element; means for holding the reflector and 4lamp back together; a light transmitting cover at the forward end of the reflector; aresilient, mounting for the cover that permits the cover to move in its plane; a door engaging the front face of the cover; and spring mechanism for separably coupling the door with a door supportingportion of the lamp structure and exerting pressure upon the cover that permits the covert move in its own plane.

a back element; a concave reiiector Vin ront of` the back element; a lamp bulb; a mounting for the lam bulb which holds the back element and re ector together; a lightytransmitting 3. A lamp structure includin 'cover at the forward end of the reflector movable in its own plane; a door engaging the front face of the cover; and spring mechanism for separably coupling the door with a door supporting portion `of the lamp structure and exerting pressure upon the cover that permits the cover to move in its own plane.

v 4. A lamp structure including a back element; a concave reflector in front of the back element; means for holding the reiiector and lampback together; a light transmitting cover at theforward end of the reiector movable in its own plane; a door engaging the front face of the cover; and spring mechanism for 'separably coupling the door with a door supportingportion of the lamp structure and exerting pressure upon` the cover that permits the cover to move in its own plane.

5.v A lamp structure including a back lelement; a concave reflector in front of the back element; a lamp bulb; a mounting for the lamp bulb which holds the back element and reflector together; a light transmitting cover at the forward end of the reflector; a

resilient mounting` for the cover that permits the cover to move in its plane; a door engaging the front face of the cover; and mechanism for separably coupling the door with Aa door supporting portion of the lamp structure and exerting pressure upon the cover that permits the cover to move in its own plane.

6. A lamp structure including a back element; a concave reflector in front of the back element.; means for holding the refiector and lamp back together; a light transmitting cover at the forward end of the reflector; a resilient mounting for the cover that 'permits the cover to move in its plane; a door engagi g thefront face of the cover;

-and mechanlsxn for separably coupling the door with va door supporting portion of the lamp structure and exerting pressure upon the cover that permits the y cover to move in its own plane.

7. A lamp structure including a back element; a concave refiector in front of the back element; a lamp bulb; a mounting for the lamp bulb which holds the back elementl and reiector together; a light transmitting cover at the forward end of the reflector movable in its own plane; a door engaging the front face of the cover; and mechanism for s eparably coupling the door with a door supporting portlon of the lamp structure and exerting pressure upon the cover that permits-the cover to move in its own plane. n

` 8. A lamp s'tructure including a backv element; a concave reflector in front of the back element; means for holding the reflector and lamp back together; alight transmitting cover at the forward end of the reiectorv movable in its ownl plane; a door engaging the front face of the cover; and mechanism for separably coupling the door with a door supporting portion of the lamp s structure and exerting pressure upon the cover that permits the cover to move in its own plane.

9. A lamp structure including a back element; .a concave reflector in front of the back element; means for holding the reflecl tor and lamp back together; .a light transmitting cover at the forward end of the rehector; a resilient mounting for the cover that permits the cover to move in its own plane; a door; and spring mechanism exerting pressure upon the'cover that permits the cover to move in its own plane.

10. A lamp structure including a back elementi; a concave reflector in front of the l' back element; means forv holding the reflec- Hector movable in its own plane; a door;

tor and lamp back together; a light transmitting cover at the forwardend of the remitting cover at the forward end of the reflector; a resilient mounting'for the cover that permits the cover to move in its ownplane; a door; and mechanism exerting pres- .sure upon the .cover that to'move in its own plane.

permits the cover 12. A lamp structure including a back element; a concave reflector 1n 'front of the back e1ement; means for holding the reflecf tor and .lamp back together; a llght transmitting cover at the forward end of the relector' movable 1n its own plane; a door; and mechanlsm exerting pressure upon the cover that permits the cover to move in-'its own plane.

y15. A lamp structure including a back element; a concave reflector in front of' the back element; means .for holding the back element and reflector together; a light transmitting cover at the front end ofthe re- -ector; a door having a rim which is in Sliding engagementwith a rim which is prol vided upon a door supporting portion of the lamp structure; and spring mechanism for separably coupling the door wlth the .supporting portion ofthe lamp structure.

14. A lamp structure including a back ele- -operatin ment; a concave reflector in front of the back element; a lamp bulb; a mounting for the lamp bulb which holds the back element and reflector together; a light transmitting cover at the front end of the reflector; a door. having a -rim which is in slldin engagement. with a rim which is provided upon a door supporting portion of the lamp structure; and spring mechanism for separably coupling the door with the supportin portion ofthe lamp structure.

15. lamp structure including a, back element; a concave reflector in front of the back element; a lamp bulb; a mounting for the lam bulb which holds the back element and re ector together; a door which is in sliding engagement with a complemental portion of the lamp structure; and spring mechanism for separably coupling the door with' the door supporting portion of the lamp structure.

16. A lamp structure including a back element; a concave reflector in front of the back element; a lamp bulb; a mounting for the lam bulb which holds the back element and re ector together; va door which is in sliding engagement with the lamp reflector; and spring mechanism 'for separably coupling the door and lamp reflector.

17. A lamp structure including a door element; a supporting element for the door; hooks carried by one of said elements and ment an door supporting element together, one of said elements belng provided with slots through which the hook ends pass; and hook engaging portions at said slots.

18. A lamp structure including a door element; a supporting element for the door;

`hooks carried by one of said elements and operatin separably to secure the door element aI. doorfsupportinof element together,

one of said elements bclng provided with slots through which the hook ends pass; and hook engaging ridges at said slots.

19. A. lamp structure including a back separably to 'secure the door eles element; a lconcave reflector in front of the" back element; a lamp bulb; a mounting for the lam bulb which holds the back element and re ector together; a light'transmitting cover at the forward end of the reflector; and a mounting for said cover that permits it to move in its own plane with reference to the reflectorand back element. 20. A lamp structure including a back element; a concave reflector in front of the back element; a lamp bulb; a mounting for the lam and re ectortogether; a light transmitting cover at the forward end of the reflector;

and a resilient mounting for said cover that permits it to move in its own plane with r( ference to the reflector and back element.

21. A lamp structure including a back element; a concave reflector infront of the bulb which holds the back element back element; means for holding the reflector and back'element in fixed relation; a light transmitting cover at the forward end ofthe reiector; and a mounting for said cover that permits it to move 1n its vown plane with reference t the reiector and back element. v

22.' A lamp structure including a backl element; a concave reflector infront ofthe back element; means for holding the reiector and-back element in lfixed relation; a light transmitting cover at the forward end of the reflector; and a resilient mounting for said cover that permits it to mover in its own plane with reference to the 'reflector and back element.

23; A lamp structure including a door; and'spring hooks 'carried by-the door and operating separably to secure the door and the portion of the 1am structure to the rear of the door together, the rear portion of the lamp structure being provided with slots through which the hook ends of the hooks project and lugs margining the slots for eng ement with the hooks. y

n-'witn'ess whereof, I hereunto subscribe my name this 17th day of` February, A. D.,

p HARRY A. DOUGLAS.

Witnesses:

HENRY C. BCWKER,

F. S. LEASURE. 

